Starter Motor Assembly: Solenoid
The Solenoid assembly is an integral part of the starter and is actually a combined relay and engagement solenoid.
The solenoid has two functions:
- Pushing the pinion forward so that it engages in the ring gear of the engine.
- Closing the moving contact, providing the main current path for the starter.
The solenoid has two windings.
- Pull-in winding
- Holding-in winding
Both windings are used to draw in the plunger and engage the pinon, only the hold-in winding is used to hold the plunger in position.